Simrad SH90 - REV A, Operator'S Manual

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Simrad SH90
Dual 1
The Dual 1 mode is a kind of “two sonars in one” operation, where
each presentation is updated for every second transmission. All
settings can be set individually for each of the two presentations.
This makes the dual mode especially useful for optimizing
settings by directly comparing the two presentations. To optimize
the horizontal settings, use the
Horizontal
menu to try different
settings in the upper picture. These settings are automatically
transferred to the other modes. The dual operation may also
be used for other user applications, where different range, tilt,
frequency and other parameters can be selected.
Dual 2
The Dual 2 mode is very similar to the Dual 1 mode previously
described, but the “two sonars” are presented next to each other.
All settings can still be set individually for each of the two
presentations.
270°/Vertical
The 270°/Vertical mode is specially designed for purse seining.
The vertical half slice is displayed in the lower left corner for
normal setting with the net on the starboard side. If the net is set
on the port side, the 60 degrees vertical slice will be displayed
in the lower right hand corner. With this presentation, it is easy
to keep the best contact with a school in both the vertical and
horizontal presentation, and to determine its size distribution.
The position of the school relative to the bottom is another
important information provided by this presentation. The
Catch
data presentation for purse seining is shown on the right hand
side. It shows all the net data relative to the target and the bottom,
as well as all available target data.
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